Improve timezone pull-request and settings page

models/schema.php

@@ -4,10 +4,7 @@ namespace Schema;
 
 function version_4($pdo)
 {
-    $pdo->exec('ALTER TABLE config ADD column timezone TEXT');
-
-    //set default timezone to UTC
-    $pdo->exec('UPDATE config SET timezone = \'UTC\'');
+    $pdo->exec("ALTER TABLE config ADD column timezone TEXT DEFAULT 'UTC'");
 }
 
 function version_3($pdo)